Pump plunger



Patented Feb. 25,1941

PATENT OFFICE rum. rLUNGnn Kirby T. Penick,.llonston, Tex.,'assignor ot onel half to Arthur J. Penick, Harris Golm, Tex.

Application July 41s, 193s, serai No. 219,338

' 2. (ci: 'sos-4) This invention relates to a pump plunger.

. It is an object or the invention to provide, a

plunger o! the character described specially designed for use in high pressure pumps. such as slush pumps, for handling heavy drilling uuid,

or drilling mud, as itis commonly called, containing gritty' substances.

'It is a further object of the inventionto provide a pump plunger of the character described l that will form a close iit with the cylinder liner of the pump to prevent leakage o! the fluid being pumped past the plunger.

It is a stillv further object of the invention to provide a plunger having a central body with i6 the parts, which are subject to wear, assembled thereon in such manner that they may be readily removed and replaced with new ones thus dispensing with the necessity ofi often replacing the It is another object oi the invention to provide a pump plunger or piston having removable pack-- ing rings, or seal rings' mounted thereon with novel means for securing said packing rings in place.

With the above and other objects in view the invention has particular relation to certain novel features of construction, arrangement or parts and use, an example of which is given in this specification and illustrated in the accompanyingl y drawing, wherein:

Figure 1 'shows a side view oi theplunger, partly s in section', located in the pump cylinder, and

' Figure 2 shows a side viewof the plunger, partly in section. as detached from the pump assembly.

'35 Referring now more particularly to the drawing wherein like numerals of reference designate the' same parts in each of the figures, the numeral i .designates the plunger body having a 'tapering bore'axially therethrough to receive the tapered 4o end 4ot the plunger rod 2. The plunger may be secured on said rod by means of the nut 3 and the lock nut 4 which are screwed onto the. ex-

ternally threaded end of the'rod in a conventional manner and as shown in Figure 1. l The body i has an external, annular ange therearound located approximately midway between'the ends or the body and whose outer margin lal is reduced in thickness forming the extermal, annular shoulders 5b, lb. Around' the reduced portion 5a are the. protecting rings i, 6 whose inner margins abut the corresponding l.shoulders 5b and whose outer margins have the inwardly turned flanges ia, 8a' which overlap the vperiphery of the reduced portion 5a and which l abut. 'Zihese rings 8 are preferably formed of` relatively soft material so as not to injure the liner 1, of the pump cylinder 8, in which the yplunger works.

4Fitted around the ends of the body Land in abutting relation with the iiange i and the-rings 5 6 are the annular seal rings or packing rings 8, 9. These packingrings arepreierably formed of rubber or similar Ayieldable material suitably` reeniorced with fabric or similar re-eniorcing material as shown. Their outer ends are formed 10 l with annular grooves forming seats for the clamp rings i0. It preferably formed of metal or similar .rigid material. The inner surfaces oi the clamp rings lli are shaped toconiorm to the shape of and to t closely in said grooves. The outer ends 15 of the packing rings terminatey in annular lips I Il which are slightly flared outwardly as shown `in Figure 2 andsvwhich are of a greater transverse diameter than the transverse diameter o! the. liner 'I so that they will be compressed into align- 2o ment with the outer surfac of the rings 6 when the plunger is inserted into the cylinder liner,as shown in Figure l, so that the lips will form a close t with the liner all the way around. Upon compression stroke of the plunger the advancing 25 lip i I will be expanded by the pressure of the iluid into close iltting contact with the liner and the trailing lip H will slightly relaxthus reducing the frictional wear on the trailing lip while the v plunger is working. 30

The ends of the body have the external.` annular grooves 2, I2 to receive the open lock rings I3, I3 which may be snapped therein to lock the corresponding rings lll lin place to hold said rings I0 pressing closely against the packing rings 9. 35

In case a part should become worn to require `replacement the corresponding ring I3 may bereadily removed to permit the easy removal and replacement of the worn part. The only parts which will be subjected to any considerable wear 4o will be the surrounding rings 6 and the packing rings A9.

The drawing and description disclose what is -now considered to be a preferred form ofthe o invention by way of illustration only. While the `45 'broad principle of the invention will be defined facing. abrupt, annular shoulders around the iiange, protecting ringsaround the reduced por.

tion of the flange whose inner margins abut the corresponding shoulders and whose outer margins have the inwardly turned ilanges which overn lap the periphery of said reduced portion and which abut, said protecting rings being formed of soft material, annular seal rings tted around the ends of said body and in abutting relation with the intermediate flange and protecting rings, said `seal rings being formed of resilient material with their outer ends provided with annular grooves forming seats, clamp rings formed of rigid material conforming in shane to and tting into said seats, snap lock rings tted into said grooves and bearing against the clamp rings and oonstantly pressing the clamp rings closely against the seal rings.

2. A plunger comprising a cylindrical body and having external, annular end grooves, an annular flange around the bod-y intermediate the ends thereof, the outer margin of said ange being reduced in thickness on each side forming outaeeaoeo 'wardly facing, abrupt, annular shoulders around the ilange, protecting rings around the reduced portion of the dange whose inner margins abut the corresponding shoulders and whose outer margins have the inwardly turnedlanges which overlap the periphery of said reduced portion and which abut, said protecting rings being formed of soft material, annular seal rings fitted around the ends of said body and in abutting relation with the intermediate iange and protecting rings, said seal rings being formed of resilient material with reinforcing fabric embedded in the packing adjacent the protecting rings and with their outer ends provided with annular grooves forming seats, clamp rings formed of rigid material conforming in shape to and tting into said seats, snap look rings ntted into said grooves and bearing against the clamp rings and constantly pressing the clamp rings closely against the seal rings.

KIRBY T. PENICK. 

